I too have been thinking of this topic for a while. If there is an obvious mistake like nanna of a word like Naam is blurry, there is nothing wrong in fixing it but if the problem is a spelling mistake, then there should be a protocol that should be following before making the change. Let's look at one of the most obvious mistake. Please ponder upon the following pankiti that everyone recites before taking Hukamnama Sahib:

The difference is in the name of the Bhatt. Printed saroops show ਟਲ but handwritten saroops, of which I have pictures, have paath ਕਲ and it makes sense too to have ਕਲ instead of ਟਲ . There is no Bhatt by the name of ਟਲ . If there had been a change in the name of Bhatt, the numbering in the end would have changed but as you can see the numbering continues to assume that the Bhatt is Kal and not Tal and it shows that Bhatt Kal has 10 pauris and not 9.

In case like the above, I personally always do paath using the correct name of the Bhatt i.e. Kal but I have not made the change in the saroop because there should be a protocol that we should employ before making the change in the Saroop of Maharaj jee. There are several other such examples where there are mistakes in the printed saroops. Talwara jee clamoured all his life to fix spelling mistakes in printed saroops but no one listened to him. God knows when SGPC will wake up to fix the spelling mistakes in printed saroops.

I am surprised to see your post,I still remember that day (few years back). I was reciting this and i pronounced it as ਕਲ and someone immedaitely coorected me that it is a name of a "Bhatt", its ਟਲ ...

but again I have a saroop printed by chattar singh jivan singh, it has lot of printing errors.Are we allowed to correct it?

I am surprised to see your post,I still remember that day (few years back). I was reciting this and i pronounced it as ਕਲ and someone immedaitely coorected me that it is a name of a "Bhatt", its ਟਲ ...

Ramansingh jeeo, as I mentioned in my previous post, all printed saroops contain ਟਲ but the correct paath as per old handwritten saroops is ਕਲ . There is no Bhatt by the name of ਟਲ since this is evident if you follow the numbering system of Bhatt Baani.